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A comparison of two recent 23-year growth periods in Sphagnum dominated hummocks reveals increased vertical growth and carbon accumulation in ombrotrophic bog, SE Norway

Utstøl-Klein, Simon
Master thesis
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UtstølSimon_Masteroppgave.pdf (3.617Mb)
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http://hdl.handle.net/11250/187039
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2013-09-06
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  • Master's theses (INA) [593]
Sammendrag
Bogs are important sinks of atmospheric carbon (C) due to their unique ability to

accumulate vast amounts of partially decomposed litter as peat, containing up to 25% of the

world’s soil carbon. Climate change and increases in nitrogen (N) deposition as a result of

human activities is expected to affect the dynamics of carbon accumulation and the fate of

the carbon sink capacity of peatlands is therefore uncertain. Increased N deposition may

alter decomposition dynamics and decrease the carbon sink ability if the layer of peatforming Sphagnum moss becomes N saturated. This study builds on a study by Ohlson and

Økland (1998a) who measured peat accumulation variables in an ombrotrophic bog, SE

Norway, in 1995. The aim of this study was to collect samples and model peat accumulation

in peat that had accumulated since 1995, and compare rates of peat accumulation to those

recorded in the previous study. Here I used the exact same location and estimated vertical

peat growth, carbon accumulation rate and peat bulk density in Sphagnum dominated

hummocks. Peat samples were gathered from the top peat layer and dated using small

pines. A subset of samples from hummocks and within the same age-range was then

derived from Ohlson and Økland (1998a) to acquire a comparable set of samples. Mean

vertical peat growth recorded in 2012 (the current study) was 64% higher compared to the

previous measurements, while the mean carbon accumulation rate and bulk density was

85% and 11% higher, respectively. Atmospheric N deposition in the region has decreased

the last three decades. Despite this, the mean peat N concentration increased from 1.06% in

the previous study, to 1.22% in the samples recorded in 2012. This indicates that the

Sphagnum layer is not currently N saturated, and that beneficial climatic conditions might

explain the increase in peat growth rates.
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Norwegian University of Life Sciences, Ås

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